Where are the exporters in the src code?

Hello, I do a lot of video conversion from raw MXF -> render video to individual frame stills for compositing and other higher-level video editing in Blender. ShotCut has been an awesome part of this process, but I would love it if I could rebuild ShotCut with a JPEG2000 exporter, if I could export video frames to JPEG2000 format that would be AWESOME! I’m thinking I could possibly patch the exporter directly from Blender or GIMP or elsewhere. I’m reasonably sure I could do this, if I could just find where those exporters are located in the source!

I downloaded the source from GitHub, could anyone tell me wherein exactly lies the exporters?

If anyone knows that this should be possible/easy/doable or any other information that would be so great!